Project storage runtime: ADR-0015 + ADR-0004/0007 amendments

Designs track-2 lifecycle and persistence end-to-end: per-command
write-through to db+yaml+csv+history.log gated by the combined db
persistence logic with commit-db-last ordering; existence-only load
with explicit rebuild command; --resume CLI flag backed by
<data-root>/last_project; in-TUI list-with-browse picker; lock file
for single-instance enforcement; fatal-banner-then-quit failure
model (with --resume making restart cheap); fatal CSV row-load
errors with full diagnosis; YYYYMMDD-word-word-word temp naming
with display-name prettifier; collision-checked names for both
temp and user-supplied projects. Project name lives only on the
filesystem (not duplicated in YAML). ADR-0004 and ADR-0007 amended
in place. requirements.md and CLAUDE.md updated; OOS-6 (global
rolling history) tracked as deferred.

docs/requirements.md

@@ -100,11 +100,12 @@ against it.
 
 - [ ] **A1** All canonical app-level commands implemented and
   available in both modes: `save`, `save as`, `load`, `new`,
-  `export`, `import`, `seed`, `replay`, `undo`, `redo`, `mode`,
-  `help`, `hint`, `quit`.
+  `rebuild`, `export`, `import`, `seed`, `replay`, `undo`,
+  `redo`, `mode`, `help`, `hint`, `quit`.
   *(Progress: `quit`/`q` and `mode simple|advanced` implemented;
-  the rest land alongside the features they belong to — `save`
-  and friends in track 2, `seed` in the seeding iteration, etc.)*
+  the rest land alongside the features they belong to — `save`,
+  `load`, `new`, `rebuild`, `export`, `import` in track 2
+  (ADR-0015), `seed` in the seeding iteration, etc.)*
 
 ## DSL data commands
 
@@ -242,8 +243,23 @@ against it.
 - [ ] **P4** `load` opens a picker listing temp projects with
   timestamps, with the option to browse to an arbitrary location.
 - [ ] **P5** `playground.db` is a derived artifact: rebuilt
-  silently when missing, rebuilt with confirmation and a change
-  summary when present (per ADR-0004).
+  silently when missing; rebuilt explicitly via the new
+  `rebuild` app-level command, which prompts with a change
+  summary before reconstructing from `project.yaml` + `data/`
+  (per ADR-0004 amendment 2 and ADR-0015 §7).
+- [ ] **P-NAME-1** Temp project directory naming pattern:
+  `<YYYYMMDD>-<word>-<word>-<word>` from a built-in wordlist
+  (ADR-0015 §2). Date-sortable; collisions checked against
+  existing folders and the slug is regenerated on the rare
+  collision. User-supplied save names that already exist as
+  folders are refused with a friendly error.
+- [ ] **P-NAME-2** Display-name prettifier converts a project
+  directory name to a human-readable display name: strip a
+  leading `YYYYMMDD-` for temp projects; split kebab / snake /
+  camel; title-case each word (ADR-0015 §2).
+- [ ] **P-NAME-3** The current project's display name is shown
+  in the UI status bar at all times, prefixed with `Project:`
+  (ADR-0015 §2).
 
 ## Project file format (per ADR-0004)
 
@@ -318,6 +334,11 @@ against it.
 ## CLI
 
 - [ ] **L1** Load a project via a positional CLI argument.
+- [ ] **L1a** `--resume` CLI flag opens the most recently used
+  project (path tracked in `<data-root>/last_project`). Errors
+  cleanly if no previous project exists or the recorded path is
+  gone; mutually exclusive with a positional path argument
+  (ADR-0015 §7).
 - [~] **L2** Submit a command alongside project load — deferred,
   not v1.
 
@@ -408,6 +429,10 @@ necessarily qualitative, the criterion is named and the bar is
 - [-] **N3** Cross-emulator visual regression coverage — per
   ADR-0008. Crossterm abstracts terminals adequately; we revisit
   only if a real regression surfaces.
+- [~] **N4** Global rolling input history (cross-session,
+  cross-project). Mentioned in I2's wording; deferred per
+  ADR-0015 §12 — project-scoped history (via `history.log`) is
+  the v1 surface. Revisit if real demand emerges.
 
 ---